Example: "An emotionally labile person"
Liable to slip, err, fall, or apostatize.
Apt or likely to change.
(of a compound or bond) kinetically unstable; rapidly cleaved (and possibly reformed).
Example: "Certain drugs can be conjugated to polymer molecules with a linkage that is labile at low ph to effect controlled release in a cellular endosome."
(of a verb) able to change valency without changing its form; especially, able to be used both transitively and intransitively without changing its form.